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I'm having the same problem with my broccoli. On 2/27 I put very little seedlings (only a few leaves) that had gotten leggy in the bed and they have only a few more leave now. And those came within the last week. Did it take them this long to get over transplant shock?

What has your weather been like? I planted all my cool season crops a couple weeks ago - mostly from seed. The broccoli and cabbage were seedlings I started. Everything is alive and just waiting for the weather to warm up a bit so I am not worried. Even though they like it cool if it just a bit too cool they will just sit there and wait.